Early autumn · Weather & things to do
Pasadena in September
Little changes in Pasadena from August: highs stay near 86°F (30°C), lows near 64°F (18°C), and about 0.1 in (3 mm) of rain falls.
Its comfort score of 88/100 is still Good, though it ranks 10th of 12 here.
- Avg high
- 86°F (30°C)
- Avg low
- 64°F (18°C)
- Rain
- 0.1 in (3 mm)
- Humidity
- 50%
- Cloud cover
- 17%
- Daylight
- ~12 h 12 min
- Comfort score
- 88/100 · Great
What September feels like
Expect proper heat: afternoons average 86°F (30°C), so plan walking and hiking for the morning and save midday for shade, lunch or a swim.
There's a big swing between day and night, about 12°C (22°F), so mornings and evenings feel much cooler than the afternoon.
It's one of the drier stretches, with only about 0.1 in (3 mm) of rain.
Sunny spells dominate: cloud cover averages 17%.
Plan around September
September is one of the lower-scoring months here; the best are March – June and October & November.
- Comfort improves from 84/100 in August to 88/100.
- Our Los Angeles New Year's Eve route is planned for Dec 30 – Jan 1, a window set by the holiday season rather than the weather — September falls outside it.
What to pack for September
- Light, breathable clothes86°F afternoons
- Sunscreen, sunglasses and a hathigh UV on clear days
- Refillable water bottleeasy to dehydrate in the heat
- A warm layer for eveningslows near 64°F
- Comfortable walking shoesmost picks involve some walking
What to do in Pasadena in September
Start early and take shelter at midday: the picks below pair morning outings with places to cool off.
The Raymond 1886
Seasonal American cooking in the former caretaker's cottage of the vanished Raymond Hotel, with a garden patio.
Why now September scores 88/100 for comfort, good conditions for being outside.
Colorado Street Bridge
Curved 1913 concrete arch bridge over the Arroyo Seco, with a walking path along the stream bed below.
Why now Highs near 86°F and 0.1 in of monthly rain make this an easy outdoor pick.
Rose Bowl Stadium
The 1922 stadium in the Arroyo Seco that hosts the Rose Bowl Game, a College Football Playoff game, on Jan 1.
Rose Parade
The Tournament of Roses parade of flower-covered floats, bands and horses, held on Colorado Boulevard since 1890.
Pasadena City Hall
Domed 1927 Spanish Revival city hall with a fountain courtyard open to visitors.
Nearby in September
- Los Angeles in September~9 mi · highs 88°F, 0.1 in rain · 1°C (2°F) warmer by day, about as wet
- Hollywood in September~11 mi · highs 88°F, 0.1 in rain · similar daytime temperatures, about as wet
- Santa Barbara in September~91 mi · highs 81°F, 0.1 in rain · 3°C (5°F) cooler by day, about as wet
- Palm Springs in September~94 mi · highs 101°F, 0.2 in rain · 8°C (15°F) warmer by day, about as wet
NASA POWER 2001–2025 monthly averages on a ~50 km grid. Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
Pasadena in September: quick answers
Is September a good time to visit Pasadena?
It's one of the tougher months here, scoring 88/100, held back mainly by heat. The best months are March – June and October & November. Expect highs of 86°F (30°C) and 0.1 in (3 mm) of rain.
How hot is Pasadena in September?
Average highs are 86°F (30°C) and average lows 64°F (18°C), making it the 3rd-warmest month by daytime highs.
Does it rain a lot in Pasadena in September?
Not much: about 0.1 in (3 mm) of rain falls across September on average, the 4th-driest month of the year. The annual total is about 13.1 in (332 mm).
What should I pack for Pasadena in September?
Bring light, breathable clothes (86°F afternoons), sunscreen, sunglasses and a hat (high UV on clear days), refillable water bottle (easy to dehydrate in the heat), a warm layer for evenings (lows near 64°F) and comfortable walking shoes (most picks involve some walking).
Planning Pasadena in September?
Bring the crew into one shared trip: vote on dates, build the day-by-day plan, split costs and share one packing list.